African elephants

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Elephants play in Kruger National Park, South Africa in this file photo. Elephants have a matriarchal society and travel in families, according to the research of of Iain Douglas-Hamilton, the 2010 winner of the $100,000 Indianapolis Prize – the largest animal conservation prize in the world. Neal J. Menschel/The Christian Science Monitor/FILE

Elephants fight at the Elephant National Park in Addo, South Africa, in July. Fernando Vergara/AP

A herd of elephants is backdropped by Mt. Kilimanjaro in Amboseli game park, Kenya, in this file photo. Karel Prinsloo/AP/FILE

An adult female, her daughter, and their calves walk on the open range in Kenya in this undated handout photo provided by the journal Science. C. Moss/AP/FILE

Mother and baby elephant graze in the bush at Lion Sands private game reserve, which borders Kruger National Park, in this file photo. Melanie Stetson Freeman/The Christian Science Monitor/FILE

Elephants roam the open plains of the Maasai Mara game reserve in Kenya in this file photo. Melanie Stetson Freeman/The Christian Science Monitor/FILE

A family of elephants gathers under a tree in Samburu game reserve in northern Kenya in this file photo. Antony Njuguna/Reuters

Two elephant calves drink water in Kenya's Tsavo East national park in this file photo. Karel Prinsloo/AP/FILE

Sgt.Duncan Lekiche, a game warden with Kenya Wildlife Services (KWS), sorts through impounded elephant tusks at KWS headquaters in Nairobi in this file photo. Iain Douglas-Hamilton, the 2010 winner of the Indianapolis Prize, spent years campaigning for a worldwide ban on ivory sales, which finally took effect in 1989. Patrick Olum/Reuters/File